## Fundamentals of Physics Extended (10th Edition)

sample answer: $\vec{a}=(3m)\hat{i}, \quad\vec{b}= (4m)\hat{i},$
Model: adding vectors in component form, (3-10 to 3-12) $\vec{r}=\vec{a}+ \vec{b}$ $r_{x}=a_{x}+b_{x} \quad r_{y}=a_{y}+b_{y} \quad r_{z}=a_{z}+b_{z}$. ---- (a) Take both vectors on the x axis, pointing in the same direction. $\vec{a}=(3m)\hat{i}, \quad\vec{b}= (4m)\hat{i},$ $\vec{r}=\vec{a}+ \vec{b}=(7m)\hat{i}$ (magnitude of r is 7)